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Note 1 - Summary of Significant Accounting Policies - Schedule of Promotional Allowances (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Food and Beverage [Member] |  |  |
Promotional allowance | $ 90,714 | $ 215,989 | $ 182,960
Occupancy [Member] |  |  |
Promotional allowance | 46,841 | 96,296 | 81,671
Product and Service, Other [Member] |  |  |
Promotional allowance | $ 5,508 | $ 14,908 | $ 11,939

X
- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References No definition available. + Details
Name: | byd_PromotionalAllowance
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_FoodAndBeverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_OccupancyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductAndServiceOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |